Explosive



UNITED STATES PATENT OFFICE.

BIRGER FIELD HALVORSEN, OF GHRISTIANIA, NORWAY.

Patented Apr. 19, 1921.

EXPLOSIVE- 375 58 Specification of Letters Patent.

No Drawing. Application filed December 4, 1919. Serial No. 342,518.

To all whom it may concern."

Be it known that I, BIRGER FJELD HAL- VORSEN, a subject of the King of Norway, residing at Christiania, Norway, have 1nvented certain new and useful Improvements in Explosives; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as Wlll enable others skilled in the art to which 1t appertains to make and use the same.

This invention has for its object an explosive consisting of a derivative of urea.

As is known organic nitro-compounds have attained a very extended use as explosives.

The most valuableexplosives of this type are those obtained from fats and from tar products as united material.

An object of the present invention 1s to make the manufacture of explosives independent of these materials, which in times of international conflicts are not easily available in sufficient quantities besides being strongly in demand for other purposes.

The invention is based upon the observation that the nitro-derivatives of urea such as for example the compound NH, NHNO:

are very strong and brisant explosives with great power of resistance against blows and shocks and in accordance with this observation the present invention has for its object the employment of the nitroderivative of urea as an explosive.

As is known the nitro-urea (00 Nrmo,

tures with other substances comprising also other explosives.

by treating urea nitrate with concentrated sulfurlc acld at a low temperature. The urea nitrate can be easily obtained with a N tr o-urea may for instance be obtained-v good output from calcium cyanamid by lixiviation with water, precipitation in the resulting solution with carbon dioxid to remove the lime and treatment of the filtrate with nitric acid either before or after the filtrate has been evaporated. It is thus possible to produce a brisant explosive from calcium cyanamid nitric acid and sulfuric acid as raw materials.

Claims.

1. As a new article of manufacture, a commercial explosive comprising an explosible nitroderivative of urea.

2. A commercial explosive comprising a nitro urea radical in chemical combination with an additional radical.

3. An explosive comprising an explosible nitroderivative of urea in mechanical mixture with other substances.

In testimony that I claim the foregoing as my invention, I have signed my name in presence of two subscribing witnesses.

BI'RGER FJELD HALVORSE-N.

Witnesses INGARD HALVORSEN, J OHN PETERSEN. 

